The present invention relates to a lawnmower cutter lifting device. The cutter is provided with a cutter insertion portion 21 in a spline shaft 10 provided in a grass cutter end head 100 and a spline groove 22 fitted in the spline shaft at an inner diameter of a center hole. A cutter 30 in which a hole 31 is formed so as to be fitted into a fitting projection 21 of the cutter seating ring 20 and a cutter 30 which is inserted into the cutter 30 and is inserted into the spline shaft 10 A circular collar 40 having a spline groove 41 at its center and having a protruding portion 42 which is assembled and brought into close contact with the cutter 30 at its edge and a seating surface 51 which is seated on the collar 40, And a nut housing 50 in which a nut 60 is stably fastened and fixed to a screw rod 11 at the end of the spline shaft 10 in a nut housing 50, And a floating blade 53 is formed with a predetermined width and a predetermined length. In the present invention constructed as described above, the float wings 53 formed on both sides of the nut housing 50 are simultaneously rotated together with the cutter 30 so that the air forced through the spaces 55 is quickly forced through the jet engine, Which generates a strong vortex film around the cutter 30, so that the cut weed or the cutter 100 collides with the cutter so that the crushed soil and stone can not be scattered and fall off directly to the bottom, It is possible to prevent the performance of the lawn mower and shorten the life span of the lawn mower by maximizing the efficiency of lawn mowing operation and to improve the reliability.본 고안은 예초기 커터 부양장치에 관한 것이다.구성의 특징으로는 예초기 자루 끝 헤드(100)에 구비된 스플라인축(10)에 커터 끼움돌부(21)를 가짐과 동시에 중앙부 구멍 내경에 상기 스플라인축에 끼워지는 스플라인홈(22) 구비하여서 된 커터 안착링(20)과, 상기 커터 안착링(20)의 끼움돌부(21)에 끼워지도록 구멍(31)이 형성된 커터(30)와, 상기 커터(30)가 끼워진 뒤 스플라인축(10)에 끼워 조립되어 커터(30)에 밀착되는 돌부(42)가 가장자리에 형성됨과 동시에 중앙부에 스플라인홈(41)을 가진 원형의 칼라(40)와, 상기 칼라(40)에 안착되는 안착면(51)과, 너트(60)가 스플라인축(10) 끝의 나사봉(11)에 안정적으로 체결 고정되도록 홈(5
